My plants were huge last year, probably close to 8'. This year I have been toying with the idea of letting them get to maybe 5' and then taking off anything taller than that. They just become so top heavy and never fruit way up high, I am thinking that maybe forcing the plant to bush out instead of up might work.

So my question is will this work? Or am I going to damage the plants by severely pruning them this way?

If I should just leave them be, then I'll have to build some bigger cages to support them. Those tiny one from HD were pretty much useless last year when the plants got taller than maybe 4'.